Grounds of Valor is training regime which is available to players in certain zones.

In order to participate in Grounds of Valor, you need to speak to a Grounds Tome and select a training page. The training page will instruct the player the type and number of mobs to kill required to finish the specific regime and will reward the player with Experience Points, Gil, Tabs, and a small bonus. These bonuses include HP/MP+, combat skill rate increases, accuracy boosts, and so on.

Prowesses

Prowesses are buffs sometimes granted upon completion of a Grounds of Valor Training Regime. Their potency can be increased with repeated completions. This is currently formatted assuming fixed potency per level.

List of possible effects

Potency per Level

Max Level

Increased treasure casket discovery.

5

Increased combat and magic skill gain.

11

Increased crystal yield.

Monsters can drop clusters(Lv?)

5

Treasure Hunter bonus.

+1 per level

3

Increased attack speed.*

4

Increased HP and MP.

3%/+1% per level past the first

11

Enhanced accuracy and ranged accuracy.

11

Enhanced attack and ranged attack.

5/+3 per level past the first

11

Enhanced magic acc. and magic atk.

11

Enhanced "Cure" potency.

4%/+% per level past the first

5

Increased weapon skill damage.

+2% per level

5

"Killer" effects bonus.

~1%

2

* Does not appear to be a direct Delay reduction (that would reduce TP gain) or a typical Magic or Gear form of Haste, which would reduce recast timers. May be Job Ability Haste, similar to Haste Samba, Hasso, and Desperate Blows.

Treasure Caskets

In addition to a new Book-based system in these zones, Treasure Caskets have been added that contain a Rare item specific to each zone. The contents of these chests are still being discovered, but they will be added as they are found. In addition to the listed drop, there are a variety of medicines and assorted crafting items available.

The quality of medicine in brown chests definitely depends on the level of the monsters, so it seems likely that the quality of the other items do as well. That said, there are reports of obtaining the Rare drop off low level monsters, at least immediately after implementation. Chest drop rate is also likely proportional to the level of the monster killed compared to your level, so fighting stronger monsters give you a better chance of a chest.

Grounds Tomes

Grounds Tomes are used to undertake Training Regimes. Unlike Fields of Valor, Grounds of Valor awards a variable number of Experience Points/Gil/Tabs based on how many times you've repeated the same training regime. The listed values are the minimum, and the maximum return is twice as much. They increase at the rate of 4% per repeat, hitting the maximum (200%) after 25 regimes. This increase in return is independent of which training regime you do, so there's no need to worry and you're free to switch between them as you like. Tabs are always 10% of the Experience Point yield, Gil is always the same as the Experience Point yield, and you can only get Tabs and Gil once per game day.